[Composer] Bump minimum PHP version to 7

- Remove paragonie/random_compat dependency

INSTALL.md

@@ -29,7 +29,7 @@ is self-signed).
 ## 1. Requirements
 
 - Apache with mod-rewrite enabled and "Options All" so you can use a local .htaccess file
-- PHP 5.6.1+ (PHP 7.1+ recommended for performance and official support).
+- PHP 7+ (PHP 7.1+ recommended for performance and official support).
 	- PHP *command line* with `register_argc_argv = true` in php.ini
 	- curl, gd (with at least jpeg support), mysql, mbstring, xml, zip and openssl extensions
 	- Some form of email server or email gateway such that PHP mail() works

composer.json

@@ -13,7 +13,7 @@
 		"issues": "https://github.com/friendica/friendica/issues"
 	},
 	"require": {
-		"php": ">=5.6.1",
+		"php": ">=7.0",
 		"ext-ctype": "*",
 		"ext-curl": "*",
 		"ext-dom": "*",
@@ -36,7 +36,6 @@
 		"mobiledetect/mobiledetectlib": "2.8.*",
 		"monolog/monolog": "^1.24",
 		"nikic/fast-route": "^1.3",
-		"paragonie/random_compat": "^2.0",
 		"pear/text_languagedetect": "1.*",
 		"psr/container": "^1.0",
 		"seld/cli-prompt": "^1.0",

doc/Install.md

@@ -25,7 +25,7 @@ Requirements
 ---
 
 * Apache with mod-rewrite enabled and "Options All" so you can use a local .htaccess file
-* PHP 5.6.1+ (PHP 7.1+ is recommended for performance and official support)
+* PHP 7+ (PHP 7.1+ is recommended for performance and official support)
   * PHP *command line* access with register_argc_argv set to true in the php.ini file
   * Curl, GD, PDO, MySQLi, hash, xml, zip and OpenSSL extensions
   * The POSIX module of PHP needs to be activated (e.g. [RHEL, CentOS](http://www.bigsoft.co.uk/blog/index.php/2014/12/08/posix-php-commands-not-working-under-centos-7) have disabled it)

doc/de/Install.md

@@ -28,7 +28,7 @@ Requirements
 ---
 
 * Apache mit einer aktiverten mod-rewrite-Funktion und dem Eintrag "Options All", so dass du die lokale .htaccess-Datei nutzen kannst
-* PHP  5.6.1+ (PHP 7.1+ wird für Performance und offiziellen Support empfohlen)
+* PHP  7+ (PHP 7.1+ wird für Performance und offiziellen Support empfohlen)
   * PHP *Kommandozeilen*-Zugang mit register_argc_argv auf "true" gesetzt in der php.ini-Datei
   * Curl, GD, PDO, MySQLi, xml, zip und OpenSSL-Erweiterung
   * Das POSIX Modul muss aktiviert sein ([CentOS, RHEL](http://www.bigsoft.co.uk/blog/index.php/2014/12/08/posix-php-commands-not-working-under-centos-7http://www.bigsoft.co.uk/blog/index.php/2014/12/08/posix-php-commands-not-working-under-centos-7) haben dies z.B. deaktiviert)